I thought jailbreaking was so I could access T-Mobile, but now I realize it's more. But now I have a phone that works with T-Mobile I just got an iPhone 5 (ME486LL/A (6.1.4), I am missing Springboard, Winterboard . . . Cydia.

It would most likely be on 6.1.4 too. I bought a 32G from T-Mo months ago and it had the latest firmware on it. I'm still using my 4s because of it.
Why in the world would you have to stay off iTunes? Confused.

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HAH! I'll bet you're right--but I was afraid it would automatically update or read my iphone or do some damage. (If I remember correctly, connecting made my first iPhone into a doorstop) Haha. Guess I missed a lot with all those jailbroken phones.

Hi, if you were unfortunately forced to upgrade to iOS6.1.3 and loose your jailbreak, then there is a way to install at least some Cydia apps if you have a Developer licence. The apps have to be self contained, not depending on other Cydia files. Examples are Movie Box and Music Box.
Some of these free .deb files can be downloaded from CydiaUpdates.net
Purchased Cydia apps are not available here. You would have to install it through Cydia on another jailbroken device and then go to its Applications folder and zip the apps folder as per the link below
...convert the deb to an ipa...JailbreakErra: Turn Cydia applications from a .DEB to an .IPA
Next add your iDevices UDID to your list of developer test devices on Apples website and create and install the resulting provisioning profile on your iDevice via email or using Xcode.
Then you have to sign the ipa with your developer profile using instasignInstaSign :: uhelios
And lastly, install the ipa using iTunes or Xcode.

Hi, if you were unfortunately forced to upgrade to iOS6.1.3 and loose your jailbreak, then there is a way to install at least some Cydia apps if you have a Developer licence. The apps have to be self contained, not depending on other Cydia files such as Movie Box, MxTube, Music Box and XBMC-iOS
Some of these free .deb files can be downloaded from CydiaUpdates.net
Purchased Cydia apps are not available here. You would have to install it through Cydia on another jailbroken device and then go to its Applications folder and zip the apps folder as per the link below
...convert the deb to an ipa...JailbreakErra: Turn Cydia applications from a .DEB to an .IPA
Next add your iDevices UDID to your list of developer test devices on Apples website and create and install the resulting provisioning profile on your iDevice using Xcode.
Then you have to sign the ipa with your developer profile using instasignInstaSign :: uhelios
And lastly, install the ipa using iTunes or Xcode.

He's correct, although you're not going to be able to install stuff that depends on a legitimate jailbreak (iFile, themes, SpringBoard tweaks, etc.). Remember though, you need to have the IPA signed with a developer profile, otherwise this won't work at all.

If you are not a registered developer then things get harder. You can get UDID activation and Provisioning profiles from a third party source like @Uhelios at uhelios - Store/Donate or some other source found via google.com.